155540501 has 2 divisors, whose sum is σ = 155540502. Its totient is φ = 155540500.

The previous prime is 155540491. The next prime is 155540507. The reversal of 155540501 is 105045551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155500900 + 39601 = 12470^2 + 199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155540501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155540507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77770250 + 77770251.

It is an arithmetic number, because the mean of its divisors is an integer number (77770251).

Almost surely, 2^155540501 is an apocalyptic number.

It is an amenable number.

155540501 is a deficient number, since it is larger than the sum of its proper divisors (1).

155540501 is an equidigital number, since it uses as much as digits as its factorization.

155540501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 155540501 is about 12471.5877497615. The cubic root of 155540501 is about 537.7921985071.

The spelling of 155540501 in words is "one hundred fifty-five million, five hundred forty thousand, five hundred one".